The standard ground plane antenna consists of a vertical radiator which
is insulated and centered between 4 horizontal surrounding radials which extend out from
the base of the antenna. Each radial is evenly spaced 90 degrees or so from each
other around the vertical element.

Enter the formula for the antenna calculation (normally 234/f):

The halfwave vertical antenna consists of a vertical radiator which is
fed from the bottom of the antenna. A matching device should be added between the antenna
and the feedline if you wish to use coax.

Enter the formula for the antenna calculation (normally 468/f):

The cubical quad antenna is a four sided antenna, with
each side a quarter wave length long. Several factors influence the
performance of the antenna, such as :

The antenna
height above the ground

The diameter of the wire
used

Nearby structures
to where the antenna is mounted

Effects of other antennas
or metal objects in the area

The conductivity of the soil

Enter the formula for the antenna (normally 1005/f):